使用快速傅立葉轉換架構之快速跳頻二位元頻移鍵送在衰落通道下抑制干擾的系統性能分析

• Main Authors: Neng-Sheng Lai, 賴能生
• Other Authors: Ing-Jiunn Su
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/69469714013326296873

碩士 === 國防大學中正理工學院 === 電子工程研究所 === 91 === The performance of jamming suppression in a fast frequency-hopping binary frequency-shift keying (FFH/BFSK) spread spectrum communication system over a fading channel is investigated in this thesis. Here﹐the technique of fast Fourier transform (FFT) is considered in the receiver implementation. The major attraction of FFT-based implementation using digital signal processors lies in its ability to achieve guaranteed accuracy and perfect reproducibility﹐and in its inherent flexibility compared with analog signal processing. The simulation result shows that the FFT-based clipper receiver performs better than the other diversity combining receivers. When considering the effect of diversity on the system performance﹐there exists an optimal diversity level to give the best bit error rate (BER) performance﹐and it depends on signal fading conditions. Especially when the signal amplitude undergoes more severe fading, the optimal diversity level is increased